JP2689159B2 - Method for manufacturing resin product with insert - Google Patents
Method for manufacturing resin product with insertInfo
- Publication number
- JP2689159B2 JP2689159B2 JP1314989A JP1314989A JP2689159B2 JP 2689159 B2 JP2689159 B2 JP 2689159B2 JP 1314989 A JP1314989 A JP 1314989A JP 1314989 A JP1314989 A JP 1314989A JP 2689159 B2 JP2689159 B2 JP 2689159B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- insert
- product
- molding
- resin material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、樹脂製品の成形技術に係り、とくにインサ
ート品を備えた樹脂製品の製造方法に関する。Description: TECHNICAL FIELD The present invention relates to a resin product molding technique, and more particularly to a method for manufacturing a resin product including an insert product.
従来から、この種樹脂製品の一例として、第２図に示
すように、環状の樹脂成形部（１）を有し、この樹脂成
形部（１）の内周に金属製の補強環（２）を同心的かつ
一体的に取り付けた歯車製品が知られている。2. Description of the Related Art Conventionally, as an example of this kind of resin product, as shown in FIG. 2, an annular resin molding portion (1) is provided, and a metal reinforcing ring (2) is provided on the inner circumference of the resin molding portion (1). Gear products are known that are concentrically and integrally mounted.
上記歯車製品は、第３図に示すような成形型（８）を
つかって射出成形法により成形されるもので、複数の分
割型を組み合わせたこの成形型（８）のキャビティ
（９）内にあらかじめ前記補強環（２）を位置決め配置
し、スプル（10）からゲート（11）を介してキャビティ
（９）内に樹脂材料を注入し、該材料の硬化を待って該
材料よりなる樹脂成形部（１）と補強環（２）を一体化
する。補強環（２）を支持する分割型（12）には補強環
（２）の軸孔（３）に嵌合する柱状突部（13）が形成さ
れており、両者を嵌め合わせることにより補強環（２）
を位置決めする。型開き後、複数の押出し棒（図示せ
ず）をつかって成形型（８）から取り出された製品に
は、補強環（２）の軸孔（３）の片側の開口を塞ぐよう
な形で前記ゲート（11）に充填された樹脂（4.第２図に
鎖線で示す）が硬化した状態で付着しているため、その
後の仕上げ工程で該樹脂（４）を切断除去（ゲートカッ
ト）する。The gear product is molded by an injection molding method using a molding die (8) as shown in FIG. 3, and is formed in a cavity (9) of this molding die (8) in which a plurality of split dies are combined. The reinforcing ring (2) is positioned and arranged in advance, a resin material is injected into the cavity (9) from the sprue (10) through the gate (11), and the resin molding part made of the material is waited for the material to cure. (1) and the reinforcing ring (2) are integrated. The split mold (12) supporting the reinforcing ring (2) is provided with a columnar protrusion (13) which fits into the shaft hole (3) of the reinforcing ring (2). (2)
Position. After opening the mold, the product taken out from the molding die (8) by using a plurality of extruding rods (not shown) has a shape such that the opening on one side of the shaft hole (3) of the reinforcing ring (2) is closed. Since the resin (4. indicated by a chain line in FIG. 2) filled in the gate (11) is attached in a cured state, the resin (4) is cut and removed (gate cut) in the subsequent finishing step. .
上記製法において、キャビティ（９）に樹脂材料を注
入する場合、該材料の一部が補強環（２）の軸孔（３）
と分割型（12）の突部（13）の間に侵入して軸孔（３）
の内側に付着することがあり、製品の外観に不良を呈し
たり、製品使用時に内側に廻ったこの樹脂がはがれて機
能的に問題を生じることがある。また製品によっては補
強環（２）の表面粗さについてスペックが厳しいものが
あり、軸孔（３）の内側に廻った樹脂を取り除く仕上げ
作業が必要となる外、該作業に際して内径面を傷付けた
りすると公差以上の寸法誤差を生じてしまうことがあ
る。これらの問題に対して従来技術は軸孔（３）と突部
（13）の寸法をシビアに押えることだけに囚われてお
り、根本的な解決策は未だ見出されていなかった。In the above manufacturing method, when a resin material is injected into the cavity (9), a part of the material is a shaft hole (3) of the reinforcing ring (2).
And the projection (13) of the split mold (12) to penetrate the shaft hole (3)
May adhere to the inside of the product, which may cause the appearance of the product to be poor, and the resin that has come to the inside when the product is used may peel off and cause a functional problem. In addition, some products have strict specifications regarding the surface roughness of the reinforcing ring (2), which requires finishing work to remove the resin that has turned inside the shaft hole (3), as well as scratching the inner diameter surface during the work. Then, a dimensional error larger than the tolerance may occur. To solve these problems, the prior art is confined only to severely pressing the dimensions of the shaft hole (3) and the protrusion (13), and a fundamental solution has not yet been found.
本発明は以上の点に鑑み、樹脂材料の余分な廻り込み
を未然に防止するインサート品を備えた樹脂製品の製造
方法を提供するもので、この目的を達成するため、成形
型のキャビティ内に略筒状を呈するインサート品を位置
決め配置し、前記キャビティに充填した樹脂材料の硬化
を待って樹脂成形部の内周に前記インサート品を一体的
に取り付ける方法において、前記インサート品の樹脂材
料注入側の端部にあらかじめ樹脂材料の局部的な廻り込
みを阻止する蓋部を一体成形し、前記蓋部にかかる樹脂
材料の注入圧によって成形型に押し付けられる他方の端
部内周にあらかじめ凹段部を形成して前記インサート品
と成形型の間に空間を設定し、成形後に前記蓋部をその
外側に付着した樹脂と一緒に切断除去することとした。In view of the above points, the present invention provides a method for manufacturing a resin product provided with an insert product that prevents excessive wraparound of the resin material, and in order to achieve this object, in a cavity of a molding die. In a method of positioning and arranging an insert product having a substantially tubular shape, and integrally mounting the insert product on the inner circumference of the resin molding portion after waiting for the resin material filled in the cavity to cure, a resin material injection side of the insert product A lid part for preventing local wraparound of the resin material is integrally molded in advance at the end of the, and a concave step is formed in advance on the inner circumference of the other end which is pressed against the mold by the injection pressure of the resin material applied to the lid. After forming, a space is set between the insert and the molding die, and after molding, the lid is cut and removed together with the resin attached to the outside thereof.
上記したように樹脂成形部の内周に略筒状を呈するイ
ンサート品を取り付ける場合には、キャビティに樹脂材
料を注入するときに、該材料がインサート品の両端のそ
れぞれから内径側へ廻り込まないように留意する必要が
ある。本発明は、この点に工夫を凝らし、まず材料注入
側の端部について、該端部にあらかじめ該端部開口を閉
塞する蓋部を一体成形して材料の廻り込みを阻止するこ
ととした。蓋部は成形後の仕上げ作業においてその外側
に付着した樹脂とともにこれを切断除去する。材料の注
入に伴なって前記蓋部には大きな圧力がかかり、インサ
ート品は蓋部を有しない他端方向に押されて蓋他端部を
成形型に押し付ける。本発明、インサート品の他方の端
部について、この材料注入圧を有効に利用することと
し、このため該端部内周にあらかじめ凹段部を形成して
インサート品と成形型の間に空間を設定した。凹段部を
形成した端部はその端面積を減少させ、成形型に対する
単位面積当りの接触圧を高めて該部シール力を向上させ
る。また、万一、該圧接シール部を洩れる材料があった
場合、該材料を空間内に貯えて、該材料がインサート品
の内径部へ廻り込むのを防止する。When attaching a substantially cylindrical insert to the inner periphery of the resin molding part as described above, when the resin material is injected into the cavity, the material does not wrap around from both ends of the insert to the inner diameter side. So you need to be careful. In the present invention, the device is devised in this respect, and the end portion on the material injection side is first integrally formed with a lid portion that previously closes the end portion opening to prevent the material from wrapping around. The lid part is cut and removed together with the resin attached to the outside in the finishing operation after the molding. A large pressure is applied to the lid portion as the material is injected, and the insert is pushed toward the other end having no lid portion to press the other end portion of the lid against the mold. According to the present invention, the material injection pressure is effectively used for the other end of the insert, and therefore a concave step is formed in advance on the inner circumference of the end to set a space between the insert and the mold. did. The end portion where the concave step portion is formed has its end area reduced, and the contact pressure per unit area with respect to the molding die is increased to improve the sealing force of the portion. Further, in the event that there is a material that leaks from the press contact seal portion, the material is stored in the space to prevent the material from wrapping around the inner diameter portion of the insert.
つぎに本発明の実施例を上記歯車製品を製造する場合
に則して説明する。Next, examples of the present invention will be described in accordance with the case of manufacturing the above gear product.
第１図は当該歯車製品の製造に用いられる成形型
（８）の一部を示し、上記従来技術の成形型（８）と比
較して補強環（２）に該部（５）を成形するのに伴なっ
てゲート（11）の位置を若干変更してなり、一の分割型
（12）に突設した柱状突部（13）に、材料注入側の端部
に該部（５）を一体成形した補強環（２）を嵌め合わせ
る。これによりスプル（10）から注入される樹脂材料は
該一端側から補強環（２）の内側に廻り込むことなくゲ
ート（11）からキャビティ（９）にかけて充填され、ゲ
ート（11）に充填された樹脂材料は蓋部（５）の外側
（図上右側）に付着し、成形後の仕上げ工程で蓋部
（５）をこの付着樹脂（４）と一緒に切断除去（第１図
破線に沿って切断）する。また補強環（２）の他端内周
にあらかじめ環状の凹段部（６）を形成し、補強環
（２）と分割型（12）の間に環状の空間（７）を設定し
ておく。材料注入時、補強環（２）は蓋部（５）に大き
な材料注入圧を受けて全体に左方向へ強く押圧されて他
端部を大きな接触圧をもって分割型（12）に押し付ける
ようになり、これに伴なって該圧接部から内径側へ樹脂
材料が漏洩するのを防止する。また万一、該圧接シール
部を洩れる材料があった場合に該材料を空間（７）内に
貯えることから該材料が補強環（２）の内径側へ廻り込
むのを防止することができる。前記他端の、分割型（1
2）への圧接を確実にするため寸法をl1＞l2となるよう
に設定する。l1とl2の差は実寸で0.1〜1mmあれば十分で
ある。FIG. 1 shows a part of a forming die (8) used for manufacturing the gear product, in which the part (5) is formed on a reinforcing ring (2) as compared with the forming die (8) of the prior art. As a result, the position of the gate (11) was slightly changed, and the columnar protrusion (13) protruding from the one split mold (12) was provided with the portion (5) at the end on the material injection side. Fit the integrally formed reinforcing ring (2). As a result, the resin material injected from the sprue (10) is filled from the one end side to the inside of the reinforcing ring (2) from the gate (11) to the cavity (9), and is filled in the gate (11). The resin material adheres to the outside (right side in the figure) of the lid portion (5), and the lid portion (5) is cut and removed together with the attached resin (4) in the finishing step after molding (along the broken line in FIG. 1). Disconnect). Further, an annular concave step portion (6) is previously formed on the inner circumference of the other end of the reinforcing ring (2), and an annular space (7) is set between the reinforcing ring (2) and the split mold (12). . At the time of material injection, the reinforcing ring (2) receives a large material injection pressure on the lid (5) and is strongly pressed to the left, so that the other end is pressed against the split mold (12) with a large contact pressure. Along with this, the resin material is prevented from leaking from the pressure contact portion to the inner diameter side. Further, in the unlikely event that there is a material that leaks from the press contact seal portion, the material is stored in the space (7), so that the material can be prevented from wrapping around to the inner diameter side of the reinforcing ring (2). Split type (1
Set the dimensions so that l 1 > l 2 to ensure pressure contact with 2). The actual difference between l 1 and l 2 is 0.1 to 1 mm.
本発明の製造方法は以上説明したように、上記補強環
などのインサート品にあらかじめ樹脂材料の不要な廻り
込みを阻止する蓋部を一体成形し、またシール力を高め
る凹段部と漏洩材料を貯える空間を設定し、成形後の仕
上げ工程で前記蓋部をその外側に付着した樹脂と一緒に
切断除去するように構成したので、インサート品の内側
に樹脂が廻り込むことがないため製品の外観不良や該樹
脂の剥離による作動不良といった弊害を未然に防止する
とともに該樹脂の除去工程を省略することができ、イン
サート品を傷付けることもない。また成形型とインサー
ト品の寸法精度をラフにとることが可能になるためこれ
に伴なって製造コストを引き下げることができる。As described above, the manufacturing method of the present invention integrally molds a lid portion that prevents unnecessary wraparound of a resin material in advance into the insert such as the above-mentioned reinforcing ring, and also provides a concave step portion and a leakage material that enhance the sealing force. Since the storage space is set and the lid part is cut and removed together with the resin attached to the outside in the finishing process after molding, the resin does not wrap inside the insert product, so the appearance of the product It is possible to prevent adverse effects such as defects and malfunctions due to peeling of the resin, omit the step of removing the resin, and do not damage the insert. Further, since the dimensional accuracy of the molding die and the insert product can be roughly taken, the manufacturing cost can be reduced accordingly.
第１図は本発明方法の実施に使用する成形型の一例を示
す要部断面図、第２図はインサート品を備えた樹脂製品
の一例を示す歯車の断面図、第３図は従来の成形型を示
す半裁断面図である。 （１）樹脂成形部、（２）補強環、（３）軸孔 （４）樹脂、（５）蓋部、（６）凹段部 （７）空間、（８）成形型、（９）キャビティ （10）スプル、（11）ゲート、（12）分割型 （13）突部FIG. 1 is a sectional view of an essential part showing an example of a molding die used for carrying out the method of the present invention, FIG. 2 is a sectional view of a gear wheel showing an example of a resin product provided with an insert product, and FIG. 3 is a conventional molding process. It is a half-cut sectional view showing a mold. (1) Resin molding part, (2) Reinforcing ring, (3) Shaft hole (4) Resin, (5) Lid part, (6) Recessed step part (7) Space, (8) Mold, (9) Cavity (10) Sprue, (11) Gate, (12) Split type (13) Projection
Claims (1)
状を呈するインサート品（２）を位置決め配置し、前記
キャビティ（９）に充填した樹脂材料の硬化を待って樹
脂成形部（１）の内周に前記インサート品（２）を一体
的に取り付ける方法において、前記インサート品（２）
の樹脂材料注入側の端部にあらかじめ樹脂材料の局部的
な廻り込みを阻止する蓋部（５）を一体成形し、前記蓋
部（５）にかかる樹脂材料の注入圧によって成形型
（８）に押し付けられる他方の端部内周にあらかじめ凹
段部（６）を形成して前記インサート品（２）と成形型
（８）の間に空間（７）を設定し、成形後に前記蓋部
（５）をその外側に付着した樹脂（４）と一緒に切断除
去することを特徴とするインサート品を備えた樹脂製品
の製造方法。1. A resin molding part in which a substantially cylindrical insert product (2) is positioned and arranged in a cavity (9) of a molding die (8), and the resin material filled in the cavity (9) is waited for to cure. In the method of integrally mounting the insert (2) on the inner periphery of (1), the insert (2)
A lid part (5) for preventing local wraparound of the resin material is integrally molded in advance at the end part of the resin material injection side, and the molding die (8) is formed by the resin material injection pressure applied to the lid part (5). A concave step portion (6) is previously formed on the inner circumference of the other end portion to be pressed against to set a space (7) between the insert product (2) and the molding die (8), and the lid portion (5) is formed after molding. ) Is cut and removed together with the resin (4) attached to the outside thereof, the method for producing a resin product having an insert product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1314989A JP2689159B2 (en) | 1989-01-24 | 1989-01-24 | Method for manufacturing resin product with insert |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1314989A JP2689159B2 (en) | 1989-01-24 | 1989-01-24 | Method for manufacturing resin product with insert |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02194919A JPH02194919A (en) | 1990-08-01 |
| JP2689159B2 true JP2689159B2 (en) | 1997-12-10 |
Family
ID=11825108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1314989A Expired - Fee Related JP2689159B2 (en) | 1989-01-24 | 1989-01-24 | Method for manufacturing resin product with insert |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2689159B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5166815B2 (en) * | 2007-10-04 | 2013-03-21 | 三菱電機株式会社 | Housing manufacturing method and mold |
-
1989
- 1989-01-24 JP JP1314989A patent/JP2689159B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02194919A (en) | 1990-08-01 |
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